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轴心通风器对航空发动机性能的提升有着重要意义,但其结构和内部流动均比较复杂,很难进行详细的试验研究。应用DPM模型对航空发动机轴心通风器内气液两相流流场进行了数值模拟。通过对比不同工况以及数学模型计算所得到的分离效率,结合试验测得数据,对轴心通风器油气分离机理和湍流的影响进行研究。结果表明:除了离心力和惯性分离对分离效果有重要影响外,湍流弥散对提高分离效率也有非常重要的作用,合理地提高湍流强度可以减少滑油消耗量。
Axial ventilator is of great significance for the improvement of aeroengine performance, but the structure and internal flow are more complex, it is difficult to conduct a detailed experimental study. The DPM model is used to simulate the gas-liquid two-phase flow in aero-engine axial ventilator. By comparing the separation efficiency calculated by different working conditions and mathematical models, the effect of turbulence on the mechanism of turbulent flow in the axial ventilator was studied based on the experimental data. The results show that in addition to centrifugal force and inertial separation have a significant impact on the separation effect, turbulence dispersion also plays an important role in improving the separation efficiency. A reasonable increase of turbulence intensity can reduce oil consumption.